A reverse adapter to 478 would be cool. 423 cpu in a late 478 mobo

If I recall correctly, there were 775 to 478 adapters at one point, 🤣, 423 cpu in a 775 using an adapter stack. Lmao. Doubt it would ever work though.

So what’s the scoop with a EE in a 423-478 adapter? Would the board run it? Poor rambus wouldn’t know what hit it! Though, may need the multi of a 3.06 for best results.

Maxiumum PC release article on the P4.

https://books.google.com/books?id=3wEAAAAAMBA … opage&q&f=false

Sphere478 wrote on 2023-11-05, 02:16:

A reverse adapter to 478 would be cool. 423 cpu in a late 478 mobo

Willamette cores went from 1.5 to 2.0 on 478 also so was 1.5 too fast for you that you wanted a 1.3 in there or what? 🤣

Good luck ! And sorry but of my 80+ spare boards not one qualifies.
If I have to chime in my personal opinion. Rambus sucks, soc 432 sucks like soc 4 does. just my opinions but there was a reason those were quickly dropped for better stuff.
Sorta like "lets do a comparison of ESDI HD's speed". Sorry Just my opinion 😀

Horun wrote on 2023-11-05, 03:27:

Good luck ! And sorry but of my 80+ spare boards not one qualifies.
If I have to chime in my personal opinion. Rambus sucks, soc 432 sucks like soc 4 does. just my opinions but there was a reason those were quickly dropped for better stuff.
Sorta like "lets do a comparison of ESDI HD's speed". Sorry Just my opinion 😀

Not having your high degree of common sense, I accidentally got saddled with one a decade or so back. However, before I could scatter it's innards to the four winds and claim it's case for righteousness, it turned it's limpid puppy eyes on me and said "please mister, I might be historic" so it has sat in the dunces corner many a year with the barest amount of tolerance. However, I don't think it's going to come out to play this round, other things happening still.

Sphere478 wrote on 2023-11-05, 02:16:

A reverse adapter to 478 would be cool. 423 cpu in a late 478 mobo

Pretty sure I have one in one of my unsorted boxes. Bought it thinking it was the reverse - run 478 in a 423 board (I wanted to see if a 64-bit Prescott would run in a 423 board, and try installing XP64 on it). I really need to sort through that box, but need to build a ton of custom shelving (well, maybe only 300/350 Kg) before I get round to that. Space constraints stopping me organising my workspace before I fill the space with mdf 😀

I won't tell anyone if you cheat... get premade/cut rack shelving units with open sides and bridge 2 together with extra planks.

I guess we should allow socket 478 but with Willamette Core only. Could rename it to P4 Willamette: Aiming for the stars.

First post updated!!!

supercordo wrote on 2023-11-05, 04:37:

I guess we should allow socket 478 but with Willamette Core only. Could rename it to P4 Willamette: Aiming for the stars.

First post updated!!!

but no doubt it's legit, my IBM Netvista comes from the factory with the 478 and the Willamette. I don't think IBM does any strange things

I have in my PC collection, a 423 P4 2000 MHz, with 1GB of RDRAM, intel chipset, the Gigabyte motherboard originally had a 1700, which I changed not long after, the RAMs were initially 256MB (2X128), later I added two more RAMs, reaching 512MB, after a few years I found 4 RDRAMs of 256MB each on sale, they are PC 1066 (instead of PC 800), and I have the 423-478 adapter, unfortunately I have never tried to put FSB CPU 533, the motherboard only reaches us in overlock, and the 533 CPUs are not willamette, in theory with the adapter I could go to 2800 (3000 maximum) with a N.W. FSB 400, but I think it's of interest because it's not a willamette, in any case I have a P4 2800 478 400 with 1.5GB of PC133 RAM, Intel 845 chipset, but I assure you that the 2000 with RDRAM is quite good.
In any case I have done various Benches with both PCs in the past, if you want I can recover them, or if you have patience, you can find them here:
https://www.xtremehardware.com/forum/topic/42 … #comment-648008

supercordo wrote on 2023-11-05, 04:37:

I guess we should allow socket 478 but with Willamette Core only. Could rename it to P4 Willamette: Aiming for the stars.

First post updated!!!

I had one of those, 1.9GHz with a gig of RDRAM. Intel board. ATI 98oo Pr0 after my GF3 Ti500 went bad. Audigy Platinum Ex. Poor choice of case on my part, always had some heat issues as a result.

Sadly, it probably got e-wasted 15 years ago... 🙁 IIRC, the last thing I really did with it was run the Vista betas in the second half of 2006.

I really do wonder if 775 boards have the right microcode to boot up Willamette on one of those 478->775 adapters.

Imagine, Willamette on nForce 790i with DDR3 and PCIe 2.0.

Error 0x7CF wrote on 2023-11-05, 14:37:

I really do wonder if 775 boards have the right microcode to boot up Willamette on one of those 478->775 adapters.

Can the later 478 boards even boot Willamette? e.g. those i865/i875 boards designed for the late Northwoods and early Prescotts...

I admit that, back in the day, I always thought they couldn't, but I have no idea why I might have thought that.

VivienM wrote on 2023-11-05, 14:47:

Can the later 478 boards even boot Willamette? e.g. those i865/i875 boards designed for the late Northwoods and early Prescotts...

I admit that, back in the day, I always thought they couldn't, but I have no idea why I might have thought that.

Not sure. I know later Intel chipset 775 boards drop support for 775 Pentiums. You may be remembering that? There appear to be very late nForce boards that list Pentium EE in them so it seems like Nvidia kept on for a very long time.

As for 478, I don't have the slightest clue. It's certainly possible, I don't think anyone was going out of their way to use a top-end 2GHz Willamette when even a relatively pokey Northwood is clocked higher and produces less heat. Under those circumstances I wouldn't be surprised by dropping support.

If no electrical issues arise, maybe a BIOS mod might do the trick.

Hmm I do have a couple Willamette P4's not in boards, a Celery 1.7G SL69Z and a 1.8Ghz P4 SL5VJ. Might have a 2Ghz Willamette version but am unsure, have to pull the heatsink and check the S-Spec lable but think it a Northwood.
I think the 865/875 dropped bios support for Willamette (not enough space for all the cpu id micro code??) , my MSI 865 board only supports Northwood and up...
just checked the ECS 848P-A v2 and it does not support Willamette either...

Error 0x7CF wrote on 2023-11-05, 14:58:

Not sure. I know later Intel chipset 775 boards drop support for 775 Pentiums. You may be remembering that? There appear to be very late nForce boards that list Pentium EE in them so it seems like Nvidia kept on for a very long time.

No, I'm thinking 478. I never had any hotburst P4s, only 65 and 45nm C2D/C2Q. I did have a late model 478 Deleron on an Abit IS7 (one of my more foolish projects, I might add...)

I'm googling random motherboard models; certainly, say, the Asus P4P800 seems to list the 1.9GHz P4 as supported. And I think 1.9 was offered only in Willamette. I can't find the Abit IS7; the IS7-E says Prescott/Northwood

On those LGA775 boards, was support dropped for microcode reasons ("why are we wasting space on this BIOS image for processors no one cares about") or VRM/hardware issues? Interestingly, I was shocked to discover only a few weeks ago that my Asus P5QL-E I've had for 15 years now supports seemingly the full line-up of Hotbursts P4s. I thought the same thing you're saying - oh, it's the last gen of the LGA775s, of course they've dropped all those P4s no one cares about in 2008, but apparently not. Maybe more processor compatibility is an Asus thing.

Error 0x7CF wrote on 2023-11-05, 14:58:

As for 478, I don't have the slightest clue. It's certainly possible, I don't think anyone was going out of their way to use a top-end 2GHz Willamette when even a relatively pokey Northwood is clocked higher and produces less heat. Under those circumstances I wouldn't be surprised by dropping support.

I liked my Willamette, but yes, I agree. Doesn't help that they launched the Northwoods with PC1066 RIMMs less than a month after I had built mine... ooooooops...

(Realistically, this was peak AMD in the enthusiast community. Only die-hard Intel fanboys like me were getting Intel systems until, probably, the launch of the i865 in 2003. i865 + northwood started to get some enthusiast following again...)

Just checked Gigabytes GA-8IK1100 rev-2x and GA-8IPE1000-G rev-4x, i875 and i865 based and their CPU support list does say Willamette 1.4G thru 2.0Ghz.
example: https://www.gigabyte.com/Motherboard/GA-8IK11 … ort#support-cpu , so besides Asus some others late model 478 still list Willamette support.

Foxconn also produced boards with i865 supporting Willamette - the manual will state. If the model begins with 865A01, it will probably support Willamette. I have the 865A01-102403 board with Willamette support. 865A01-PE is another model stating support.